-Prov: Don't be a trouble maker ,let the fuck alone it's gunna beget trouble.
-To not talk about things which have caused problems in the past, or to not try to change a situation because you might cause problems.

Jill: Should I ask the boss if he's upset at my coming in late in the mornings?
Jane: If he hasn't said anything about it, just let sleeping dogs lie. I thought I would ask Jill if she wanted me to pay her back right away, but then I decided to let sleeping dogs lie.